19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The concentration of a solution or the amount of substance present in its given volume can be expressed in any of the following ways.
The amount of solute in moles per unit volume is_______.
NH3 is produced according to the following reaction: N2(g) + 3H2(g) -> 2NH3(g) In an experiment 0.25 mol of NH3 is formed when 0.5 mol of N2 is reacted with 0.5 mol of H2. What is % yield ?
If 0.5 mole of BaCl2 is mixed with 0.20 mole of Na3PO4, the maximum number of moles of Ba3(PO4)2 then can be formed is
0 3 . x x
Calculate the number of oxygen atoms required to combine with 7.0g of N2 to form N2O3 if 80% of N2 is converted into products. N O N O ->
ms ato x Therefore, X 3 10 x atoms Number of moles=Moles N 3.0 10 6.022 10 mol 160.58 / 1.6 10 A M M g mol x >> x x x >> x
If 80.00 g of X combines with 1.5 × 1023 atoms of Y to form X2Y without any of either element remaining, what is the atomic weight of X ?
1 mole of oxalic acid is treated with conc. H2SO4. The resultant gaseous mixture is passed through a solution of KOH. The mass of KOH consumed will be (where KOH absorbs CO2.) (COOH)2 CO + CO2 + H2O 2 KOH + CO2…
How many moles of ferric alum (NH ) SO Fe (SO ) .24 H2O can be made from the sample of Fe containing 0.0056 g of it ?
NaOH is formed according to the reaction 2Na O Na O -> Na O H O 2NaOH -> To make 4g of NaOH, Na required is
What is the weight of oxygen required for the complete combustion of 2.8 kg of ethylene ?
Which of the given reactions are counted as balanced reactions? (a) H +O 2H O -> (b) 4Al+3O 2Al O -> (c) Mg OH +2HNO 2Mg NO +2H O -> (d) N +3H NH -> Ans. (b) Sol. Al O Al O -> is a balanced reaction because the n…
According to the law of conservation of mass …A… has the same number of atoms of each element on both sides of the equation. Here, A refers to
Determine the empirical formula of Kelvar, used in making bullet proof vests, is 70.6% C, 4.2% H, 11.8% N and 13.4% O
An organic compound has an empirical formula CH O . It’s vapour density is 45. The molecular formula of the compound is
The empirical formula of a compound is CH2. One mole of this compound has a mass of 42 g. Its molecular formula is
The simplest formula of a compound containing 50% of an element X (atomic weight 10) and 50% of element Y (atomic weight 20) is :
A compound was found in contain 21.67% Mg, 21.4% C and 57.0% O by mass of oxygen. What is the simplest formula of this compound ?
What is the empirical formula of a compound composed of O and Mn in equal weight ratio?
An oxide of metal (M) has 40% by mass of oxygen. Metal M has atomic mass of 24. The empirical formula of the oxide is
A gas has molecular formula (CH)n. If vapour density of the gas is 39, what should be the formula of the compound?
An organic compound containing C and H has 92.3% of carbon, its empirical formula is
A Compound contains 69.5% oxygen and 30.5% nitrogen and its molecular weight is 92. The molecular formula of compound is
If two compounds have the same empirical formula but different molecular formula, they must have